[rules-users] list operations in "then" part

[Simon Chen]

No, this doesn't work...

Drools-5.2 doesn't help either :-(

2011/6/2 Joe White <Joe.White at recondotech.com>:
> If you cast $b on the RHS it will probably work. We’ve had to do this in the
> past for rules like this.
>
>
>
> ….
>
> then:
>  Test fact = new Test();
>
> Book rhsBook = (Book)$b;
>  fact.getList().addAll( rhsBook.authors );
>  insert(fact);
> end
>
>
>
>
>
> From: rules-users-bounces at lists.jboss.org
> [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Mark Proctor
> Sent: Thursday, June 02, 2011 8:52 AM
> To: rules-users at lists.jboss.org
> Subject: Re: [rules-users] list operations in "then" part
>
>
>
> On 02/06/2011 08:14, Wolfgang Laun wrote:
>
> On 1 June 2011 21:43, Simon Chen <simonchennj at gmail.com> wrote:
>
> Hi all,
>
> I am always confused about what we can do in the "then" part of the rule.
>
> In particular, I have problem duplicate a list. For example:
>
> when:
>  $b: Book( "james" memberOf authors )
> then:
>  Test fact = new Test();
>  fact.getList().addAll( $b.authors );
>  insert(fact);
> end
>
> The error message reads like this:
>
> BuildError: Unable to build expression for 'consequence': [Error:
> Failed to compile: 2 compilation error(s):
>  - (1,7) unqualified type in strict mode for: $b
>  - (1,12) unqualified type in strict mode for: authors]
>
> What is the right way to do this?
>
> Granted - the error message is a puzzle in itself, but basically, the RHS
> must be written according to Java rules. Hence, if $b is an object of type
> Book, $b.authors depends on the (Java!) visibility of member authors. If it
> isn't public, you must use the getter.
>
> I believe he's using "mvel" judging by the error.
>
> mark
>
>
> -W
>
>
> Thanks.
> -Simon
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